I generated a certificate and it’s verified correctly.
I noticed the signature’s Merkle proof is empty(shown below) in the certificate file.
so I want to ask how to get proof value and write it in the certificate file.

I believe the proof is supposed to be empty unless it’s issued with a batch of certificates. In this case, the target hash is the merkle root, so there’s no need to traverse the “proof” which would consist of a series of Left:, Right: statements that let one find the hash given the merkleRoot